SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 45: Photonics III
Q 45.7: Vortrag
Donnerstag, 9. März 2023, 12:30–12:45, A320
Optical control of one-dimensional topological end states via soliton formation — •Christina Jörg1,2, Marius Jürgensen2, Sebabrata Mukherjee3, and Mikael C. Rechtsman2 — 1Physics Department and Research Center OPTIMAS, TU Kaiserslautern, D-67663 Kaiserslautern, Germany — 2Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA — 3Department of Physics, Indian Institute of Science, Bangalore 560012, India
Solitons are solutions of the nonlinear Schrödinger equation that maintain their shape during propagation. Here we show that soliton formation can be used to optically induce and control a linear topological end state in the bulk of a Su-Schrieffer-Heeger (SSH) lattice, using evanescently-coupled waveguide arrays. We observe an abrupt nonlinearly-induced transition above a certain power threshold due to an inversion symmetry-breaking nonlinear bifurcation of the soliton. We use a pump-probe framework such that the dynamics of the soliton is only coupled to the end state via the potential it induces, meaning that we may control the end state independently and all-optically. Specifically, we use orthogonal polarizations for the pump and probe: The pump induces the soliton and the probe experiences the potential induced by the soliton in which an end state appears as a result. In our case, the soliton acts as an all-optical switch to turn on and off the topological (linear) end state. Our results demonstrate all-optical active control of topological states.